Category Nuances for hydrogen:

• light,
• commonplace,
• large,
• combustible,
• liquified,
• acidic,
• supportive,
• energetic,
• elemental,
• aromatic,
• conventional,
• rich,
• simple,
• flammable,
• miscellaneous,
• inert,
• nonflammable,
• metallic,
• level,
• natural,
• monovalent,
• malodorous,
• common,
• acid,
• volatile,
• hydrophobic,
• refrigerated,
• physiological,
• working,
• inflammable,
• harmless,
• suitable,
• fixed,
• polar,
• ordinary,
• molecular,
• supplemental,
• liquefied,
• undesirable,
• hazardous,
• luminescent,
• free,
• minor,
• atmospheric,
• real,
• limited,
• nonmetal,
• organic,
• standard,
• protective,
• relevant,
• dry,
• nonmetallic,
• environmental,
• physicochemical,
• harmful,
• number,
• oxidizable,
• individual,
• complex,
• diffusing,
• vital,
• important,
• dissolved,
• additional,
• functional,
• synthetic,
• clean,
• conductive,
• intermediate,
• dangerous,
• identifiable,
• valuable,
• stable,
• expensive,
• atomic,
• cryogenic,
• basic,
• bound,
• explosive,
• transparent,
• soluble,
• similar,
• diatomic,
• mobile,
• planetary,
• mixed,
• antibacterial,
• supercritical,
• benign,
• hot,
• desirable,
• classical,
• base,
• special,
• charged,
• liquid,
• numerous,
• fast,
• nonpolar,
• heavier,
• lighter,
• lightweight,
• small,
• inorganic,
• ionic,
• poisonous,
• gaseous,
• major,
• supporting,
• technical,
• noble,
• antimicrobial,
• pendant,
• ambient,
• tangible,
• deleterious,
• residual,
• familiar,
• binding,
• essential,
• unwanted,
• main,
• frozen,
• fissionable,
• metabolic,
• auxiliary,
• medical,
• separate,
• dense,
• tenuous,
• secondary,
• corrosive,
• cold,
• shared,
• guest,
• beneficial,
• buoyant,
• pure,
• dilute,
• monoatomic,
• reactive,
• impure,
• available,
• molten,
• useful,
• foreign,
• permanent,
• industrial,
• active,
• extraneous,
• interfering,
• compressible,
• single,
• compressed,
• raw,
• monatomic,
• insoluble,
• deadly,
• electronegative,
• toxic,
• inanimate,
• heated,
• diamagnetic,
• invisible,
• consumable,
• starting,
• dusty,
• mental,
• particular,
• chemical,
• noxious,
• rare,
• neutral,

Simple Categories for hydrogen:

• measure,
• atom,
• gas,
• element,
• thing,
• solid,
• substance,
• liquid,
• quantity,
• fluid,
• material,
• fumes,
• constituent,
• substrate,
• atmosphere,
• solute,
• component,
• group,
• object,
• oxygen,
• residue,
• air,
• mixture,
• system,
• volatile,
• unit,
• matter,
• stuff,